<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<script>
  new Promise((resolve, reject) => {
    setTimeout(() => {
      // resolve('Hello Vuejs')
      reject('error message')
    }, 1000)
  }).then(data => {
    console.log(data);
  }, err => {
    console.log(err);
  })
</script>
</body>
</html>